Stay-bolt-heading attachment for pneumatic hammers.



W. H. DIFFENDALL.

STAY BOLT HEADING ATTACHMENT FOR PNEUMATIC HAMMERS APPLICATION FILEDSEPT. 20, HHS.-

Patented J an. 9, 1917.

ibneooeo WALTER, H. DIFFENDALL, OF HAGERSTOVJN, MARYLAND.

' STAY-BOLT-I-IEADING ATTACHMENT FOR PNEUMATIC HAMMERS.

Application filed September 20, 1915.

To all whom it may concern:

Be it known that I, l VALTER H. DIFFEN- DALL, a citizen of the UnitedStates, residing at Hagerstown, in the county of lashington and State of-Maryland, have invented certain new and useful Improvements inStay-Bolt-l-leading Attachments for Pneumatic Hammers; and I herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, which formpart of this specification.

-This invention is a novel stay bolt heading attachment for pneumatic orfluid actuated hammers and its object is to enable an ordinary pneumatichammer to be used for heading stay bolts, countersunk rivets, etc., inboilers and tanks, and on structural steel and iron work.

The invention consists in a novel attachment for ordinary pneumatichammers whereby more perfect heads can be made, marking or injuring ofthe sheets will be prevented, and more work can be performed in. acertain time than by present methods, thus economizing both time andlabor.

I will explain the invention in connection with the accompanyingdrawings in which Figure 1 represents a detail sectional elevation of apneumatic hammer with the attachment applied. Fig. 2 is an enlarged sideview of the attachment detached. Fig. 3 is a vertical section throughFig. 2. Fig. l is a detail plan view indicating in dotted lines themanner of using the attachment in heading a stay-bolt.

The attachment may be used in connection with a fluid actuated hammer ofordinary type, or of any preferred construction. As indicated in thedrawing an ordinary pneumatic hammer A is shown; said hammer having abarrel B within which works a plunger]? in the usual manner. My novelattachment is adapted to be detachably fitted to the lower end of thebarrel B, and, as shown, comprises an approximately cupshaped casting 1having a sleeve portion 1 on its upper end forming a socket adapted toreceive the lower end of the barrel B, so that the attachment may bereadily slipped onto the end of the barrel B and be retained in positionthereon by the close fit, or by other suitable means. The attachmentbeing slipped over the end of the barrel does not require any alterationin the barrel. On the bottom of this casting is an annular Specificationof Letters Patent.

Patented Jan. 9, 1917.

Serial No. 51,654.

flange 1 which surrounds or forms a-recess in the bottom of the castingconsiderably larger in diameter than the head of the bolt or rivet to beformed. The casting is also provided with an axial opening or bore 1preferably having an inwardly projecting flange l at its upperend, andthe bore 1 accommodates the head 2* of a ram 2 which extends into thebarrel B and is adapted to be struck by the plunger P.

In use the recessed lower end of the casting 1 is placed over the headend 1 of a bolt or rivet, R, to be headed, and the casting movedeccentrically of such bolt until the flange i on the lower edge of thecasting engages the edge of the head so that the ram 2 will be seteccentric to the rivet as indicated in Figs. 3 and 4, and when thehammer is in operation and as the plunger is reciprocated the casting isturned around the bolt or rivet, so as to move the ram 2 orbitallyaround the rivet head as indicated in dotted lines in Fig. 4, and theram hammers down the head, shaping it to the form indicated in Fig. 3.

The attachment can be turned around the bolt head with one hand keepingthe inner edge of the flange 1- against the edge of the bolt end whilethe hammer is held with the other hand and the operating valve worked inthe usual way. The hammer could itself be also moved around the boltwhile flange it keeps the ram in proper position relative to the bolt.

Fig. 3 shows in dotted lines the action of the ram upon the end of thestay bolt, 1" indicating the head formed on the bolt. In 'Fig. 4: thehead 1 of the bolt is shown in dotted lines, and the dotted circle 3indicates the orbital path through which the attachment is moved duringthe heading operation. No special make of pneumatic hammer is requiredwith this invention, it can be readily adapted for use with any ordinarypneumatic hammer without any alteration in the latter. The orbitalmovement of, the attachment around the aXis of the bolt or rivet Whilethe hammer is operating results in producing a round even head on thebolt, and no strokes are lost or wasted on the sheets, and the work istherefore performed in a superior manner and in the minimum time. Theattachment also prevents the ram from striking and injuring the metalsheets, and confines every stroke of the ram to the head of the bolt orrivet. The attachment also protects the workman against injury as itguards his fingers and prevents them being caught between the ram andhammer barrel while the tool is in use, and he can safely manipulate theattachment with one hand while holding the hammer with the other.

A hammer with such attachment can be very easily manipulated and itswork can be properly performed in positions and places where it would bediflicult or impossible to use an ordinary pneumatichammer alone.

The attachment will enable tight well formed heads to be formed on staybolts and rivets, and is particularly designed and adapted for use inheading stay bolts which are driven cold while ordinary rivets aredriven hot. By properly shaping the head end of the ram 2 it can also beadapted for countersinking the ends of rivets or bolts and the like.

That I claim is:

An attachment for pneumatic hammers, comprising a casting having asleeve portion on its upper end adapted to detachably fit over the endof the hammer barrel, an

Copies of this patent may be obtained for axial bore of less diameterfor the passage of the shank of a ram, and a flange at the upper end ofthe bore to limit the upward movement of the ram, and a circumferentialflange on the lower end of the casting forming a guide to keep theattachment in proper position relative to the object being operatedupon; with a ram having a head slidably fitted in said bore below theflange at the upper end thereof, and a shank extending above said flangeand adapted to be engaged by the hammer-plunger; said attachment beingadapted to be placed eccentrical to the bolt or rivet with the lowermostflange against the head of the rivet and then moved orbitally around thehead while the hammer is in operation.

In testimony that I'claim the foregoing as my own, I affix my signaturein presence of two witnesses.

Witnesses:

C. A. LITTLE, BERTHA F. LUDWIG.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

